Headlight.



O. WINSTON.

HEADLIGHT. J APPLICATION FILED OCT. 5.19I6.

1,273,969. Patented July s0,191&.

W/ T/YE55E6 /Nz/ /vme 35W Over/on )Wnsfo a) H/SATTORN ovm'ron wnws'rox, or MINNEAPOLIS, umnnso'r'a.

Hmnmea'r.

p ifi a Letters Patent. Patented July 30, 1918.

' Application filed October a, me. sci-m no. 123,847.

To all whom it may concern:

, Be itknown that I, OVERTON WINs'ro'N, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Headlights; and I do hereby declare the following to be a full, clear, and exact description.

of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Particularly, my. invention relates to headlights provided with shifting light sources within concave reflectors, and the invention provides, in combination therewith, a frosting or light dimming obstructing surface bf novel relative arrangement, all as will hereinafter more full appear. f

The invention 1s illustrated in the accompanying drawings wherein like characters indicate like parts throughout the several views. Referring to the drawings:

Figure 1 shows the reflector in'vertical section and a two-filament light bulb in side elevation; and

Fig. 2 is a front elevation of the headlight, parts of the reflector being broken away,

The reflector is indicated by the numeral 1 and the light bulb b the numeral 2. This light bulb has two filaments, the hot spots of which are indicated, one at a and the other at b. The hot spot of filament a is at the axis of the reflector and the hot spot of the filament b is vertically-offset and materially above the axis of said reflector.

In practice, the two filament light bulb employed may be, and preferably is combined with electrical connections and switches, such, for example, as illustrated in my pending application, S. N. 86,852, filed March 27th, 1916, and entitled Headlights.

In Fig. 1, line 0 radiates from b to the upper edge of the reflector; line 03 is a horizontal line or line parallel to the axis of the reflector and which intersects point 6; and the lines 6 and f are lines radiating from point bat angles to lines (1 and 0. The globe or the light bulb 2 is provided with a frosting or light dimming surface 3 on its upper front portion. This frosting 3, in a general way, may be described as approximately semicircular. Its lower edge is approximately in a lane that intersects line e and a horizontal ine at b, but is preferably effect.

in a trulyliorizontal plane, so that in front elevation, the lower line of said frostin appears as stralgh't. The upper edge 0 the said frosting 3 is curved and is described by oscillating line f on point I) while keep- 1ng the same always at the constant angle to lines -corresponding to a which radiate from b to the' edge of the reflector. Inasmuch as the globe of the light bulb 2 will usually be spherical, the curved line of. the upper edge of the frosting ,0 will deviate slightly from a true circular curve.

For long beam projection, such as required for country road driving, the light source will be at filament a, while for city driving, where objectionable blindin effects must be'avoided, the light source w1ll be at filament 6. Line e makes such angle to horizontal line d, that whenli ht source is at V b the direct rays projected low the frosting 3 will have only such .elevation that they will reach the eyes of a erson in a passing machine only at such ong distance that there will not then be any serious blinding All of the direct rays from source b which would tend to produce serious blinding effect are dimmed by frostin 3. Direct rays from b from above the rosting, or within zone fc, are given such elevation that they willnot strike the eyes of a person in a passing machine until the passing machine is so close that-such rays will be from one side, and not directly 1n the line of vision of persons in a passing machine,

and hence, willnot produce serious blinding efl'ect.

The frosting above described is about the smallest size capable of use in the preven-, tion of serious blinding effects. This smallthe other above the axis of said reflector, and

the globeof said bu'lbhaving a frosting or light dimming surface on its upper front portion terminated at its lower edge above a line that is parallel to the axis of the reflector and intersects said vertically offset filament, and the'upper edge of which terminates below a line that radiates from said 110 offset filament and touches the rim of said 1ts approximately straight edge at the bot-' tom thereof, the curved upper edge of said frosting following a line intersected by an imaginary line oscillated from the hot spot of said offset filament and maintained always at a constant angle to another line drawn from said oifset filament and inter- 10 secting the rim of said reflector.

In testimony whereof I afiix my signature in presence of two witnesses.

OVERTON WINSTON. Witnesses: I

' BERNIOE G. WHEELER, HARRY D. KILGORE L 

